439 lines
12 KiB
C
439 lines
12 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* pikaoperationlayermode-composite.c
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* Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
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* 2017 Øyvind Kolås <pippin@gimp.org>
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* 2017 Ell
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gegl-plugin.h>
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#include <cairo.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include "../operations-types.h"
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#include "pikaoperationlayermode-composite.h"
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/* non-subtractive compositing functions. these functions expect comp[ALPHA]
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* to be the same as layer[ALPHA]. when in[ALPHA] or layer[ALPHA] are zero,
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* the value of comp[RED..BLUE] is unconstrained (in particular, it may be
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* NaN).
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*/
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void
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pika_operation_layer_mode_composite_union (const gfloat *in,
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const gfloat *layer,
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const gfloat *comp,
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const gfloat *mask,
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gfloat opacity,
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gfloat *out,
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gint samples)
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{
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while (samples--)
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{
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gfloat new_alpha;
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gfloat in_alpha = in[ALPHA];
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gfloat layer_alpha = layer[ALPHA] * opacity;
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if (mask)
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layer_alpha *= *mask;
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new_alpha = layer_alpha + (1.0f - layer_alpha) * in_alpha;
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if (layer_alpha == 0.0f || new_alpha == 0.0f)
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{
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out[RED] = in[RED];
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out[GREEN] = in[GREEN];
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out[BLUE] = in[BLUE];
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}
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else if (in_alpha == 0.0f)
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{
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out[RED] = layer[RED];
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out[GREEN] = layer[GREEN];
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out[BLUE] = layer[BLUE];
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}
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else
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{
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gfloat ratio = layer_alpha / new_alpha;
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gint b;
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for (b = RED; b < ALPHA; b++)
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out[b] = ratio * (in_alpha * (comp[b] - layer[b]) + layer[b] - in[b]) + in[b];
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}
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out[ALPHA] = new_alpha;
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in += 4;
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layer += 4;
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comp += 4;
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out += 4;
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if (mask)
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mask++;
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}
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}
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void
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pika_operation_layer_mode_composite_clip_to_backdrop (const gfloat *in,
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const gfloat *layer,
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const gfloat *comp,
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const gfloat *mask,
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gfloat opacity,
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gfloat *out,
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gint samples)
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{
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while (samples--)
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{
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gfloat layer_alpha = comp[ALPHA] * opacity;
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if (mask)
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layer_alpha *= *mask;
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if (in[ALPHA] == 0.0f || layer_alpha == 0.0f)
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{
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out[RED] = in[RED];
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out[GREEN] = in[GREEN];
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out[BLUE] = in[BLUE];
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}
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else
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{
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gint b;
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for (b = RED; b < ALPHA; b++)
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out[b] = comp[b] * layer_alpha + in[b] * (1.0f - layer_alpha);
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}
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out[ALPHA] = in[ALPHA];
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in += 4;
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comp += 4;
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out += 4;
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if (mask)
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mask++;
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}
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}
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void
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pika_operation_layer_mode_composite_clip_to_layer (const gfloat *in,
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const gfloat *layer,
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const gfloat *comp,
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const gfloat *mask,
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gfloat opacity,
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gfloat *out,
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gint samples)
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{
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while (samples--)
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{
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gfloat layer_alpha = layer[ALPHA] * opacity;
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if (mask)
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layer_alpha *= *mask;
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if (layer_alpha == 0.0f)
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{
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out[RED] = in[RED];
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out[GREEN] = in[GREEN];
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out[BLUE] = in[BLUE];
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}
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else if (in[ALPHA] == 0.0f)
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{
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out[RED] = layer[RED];
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out[GREEN] = layer[GREEN];
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out[BLUE] = layer[BLUE];
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}
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else
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{
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gint b;
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for (b = RED; b < ALPHA; b++)
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out[b] = comp[b] * in[ALPHA] + layer[b] * (1.0f - in[ALPHA]);
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}
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out[ALPHA] = layer_alpha;
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in += 4;
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layer += 4;
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comp += 4;
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out += 4;
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if (mask)
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mask++;
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}
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}
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void
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pika_operation_layer_mode_composite_intersection (const gfloat *in,
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const gfloat *layer,
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const gfloat *comp,
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const gfloat *mask,
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gfloat opacity,
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gfloat *out,
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gint samples)
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{
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while (samples--)
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{
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gfloat new_alpha = in[ALPHA] * comp[ALPHA] * opacity;
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if (mask)
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new_alpha *= *mask;
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if (new_alpha == 0.0f)
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{
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out[RED] = in[RED];
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out[GREEN] = in[GREEN];
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out[BLUE] = in[BLUE];
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}
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else
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{
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out[RED] = comp[RED];
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out[GREEN] = comp[GREEN];
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out[BLUE] = comp[BLUE];
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}
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out[ALPHA] = new_alpha;
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in += 4;
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comp += 4;
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out += 4;
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if (mask)
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mask++;
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}
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}
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/* subtractive compositing functions. these functions expect comp[ALPHA] to
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* specify the modified alpha of the overlapping content, as a fraction of the
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* original overlapping content (i.e., an alpha of 1.0 specifies that no
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* content is subtracted.) when in[ALPHA] or layer[ALPHA] are zero, the value
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* of comp[RED..BLUE] is unconstrained (in particular, it may be NaN).
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*/
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void
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pika_operation_layer_mode_composite_union_sub (const gfloat *in,
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const gfloat *layer,
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const gfloat *comp,
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const gfloat *mask,
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gfloat opacity,
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gfloat *out,
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gint samples)
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{
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while (samples--)
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{
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gfloat in_alpha = in[ALPHA];
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gfloat layer_alpha = layer[ALPHA] * opacity;
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gfloat comp_alpha = comp[ALPHA];
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gfloat new_alpha;
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if (mask)
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layer_alpha *= *mask;
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new_alpha = in_alpha + layer_alpha -
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(2.0f - comp_alpha) * in_alpha * layer_alpha;
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if (layer_alpha == 0.0f || new_alpha == 0.0f)
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{
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out[RED] = in[RED];
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out[GREEN] = in[GREEN];
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out[BLUE] = in[BLUE];
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}
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else if (in_alpha == 0.0f)
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{
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out[RED] = layer[RED];
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out[GREEN] = layer[GREEN];
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out[BLUE] = layer[BLUE];
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}
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else
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{
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gfloat ratio = in_alpha / new_alpha;
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gfloat layer_coeff = 1.0f / in_alpha - 1.0f;
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gint b;
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for (b = RED; b < ALPHA; b++)
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out[b] = ratio * (layer_alpha * (comp_alpha * comp[b] + layer_coeff * layer[b] - in[b]) + in[b]);
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}
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out[ALPHA] = new_alpha;
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in += 4;
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layer += 4;
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comp += 4;
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out += 4;
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if (mask)
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mask++;
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}
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}
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void
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pika_operation_layer_mode_composite_clip_to_backdrop_sub (const gfloat *in,
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const gfloat *layer,
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const gfloat *comp,
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const gfloat *mask,
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gfloat opacity,
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gfloat *out,
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gint samples)
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{
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while (samples--)
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{
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gfloat layer_alpha = layer[ALPHA] * opacity;
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gfloat comp_alpha = comp[ALPHA];
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gfloat new_alpha;
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if (mask)
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layer_alpha *= *mask;
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comp_alpha *= layer_alpha;
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new_alpha = 1.0f - layer_alpha + comp_alpha;
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if (in[ALPHA] == 0.0f || comp_alpha == 0.0f)
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{
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out[RED] = in[RED];
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out[GREEN] = in[GREEN];
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out[BLUE] = in[BLUE];
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}
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else
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{
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gfloat ratio = comp_alpha / new_alpha;
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gint b;
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for (b = RED; b < ALPHA; b++)
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out[b] = comp[b] * ratio + in[b] * (1.0f - ratio);
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}
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new_alpha *= in[ALPHA];
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out[ALPHA] = new_alpha;
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in += 4;
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layer += 4;
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comp += 4;
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out += 4;
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if (mask)
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mask++;
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}
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}
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void
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pika_operation_layer_mode_composite_clip_to_layer_sub (const gfloat *in,
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const gfloat *layer,
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const gfloat *comp,
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const gfloat *mask,
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gfloat opacity,
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gfloat *out,
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gint samples)
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{
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while (samples--)
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{
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gfloat in_alpha = in[ALPHA];
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gfloat layer_alpha = layer[ALPHA] * opacity;
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gfloat comp_alpha = comp[ALPHA];
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gfloat new_alpha;
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if (mask)
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layer_alpha *= *mask;
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comp_alpha *= in_alpha;
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new_alpha = 1.0f - in_alpha + comp_alpha;
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if (layer_alpha == 0.0f)
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{
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out[RED] = in[RED];
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out[GREEN] = in[GREEN];
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out[BLUE] = in[BLUE];
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}
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else if (in_alpha == 0.0f)
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{
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out[RED] = layer[RED];
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out[GREEN] = layer[GREEN];
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out[BLUE] = layer[BLUE];
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}
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else
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{
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gfloat ratio = comp_alpha / new_alpha;
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gint b;
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for (b = RED; b < ALPHA; b++)
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out[b] = comp[b] * ratio + layer[b] * (1.0f - ratio);
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}
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new_alpha *= layer_alpha;
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out[ALPHA] = new_alpha;
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in += 4;
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layer += 4;
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comp += 4;
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out += 4;
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if (mask)
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mask++;
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}
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}
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void
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pika_operation_layer_mode_composite_intersection_sub (const gfloat *in,
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const gfloat *layer,
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const gfloat *comp,
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const gfloat *mask,
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gfloat opacity,
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gfloat *out,
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gint samples)
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{
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while (samples--)
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{
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gfloat new_alpha = in[ALPHA] * layer[ALPHA] * comp[ALPHA] * opacity;
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if (mask)
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new_alpha *= *mask;
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if (new_alpha == 0.0f)
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{
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out[RED] = in[RED];
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out[GREEN] = in[GREEN];
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out[BLUE] = in[BLUE];
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}
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else
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{
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out[RED] = comp[RED];
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out[GREEN] = comp[GREEN];
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out[BLUE] = comp[BLUE];
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}
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out[ALPHA] = new_alpha;
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in += 4;
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layer += 4;
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comp += 4;
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out += 4;
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if (mask)
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mask++;
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}
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}
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